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In this trick, hold your hand over a burning candle without getting burned, by reflecting and transmitting the light of two candles. This activity is best suited as a demonstration.

In this activity, learners work in groups to create a time line representing significant moments in their lives.

When you teeth clatter, they make quite the racket disproportionately to how much they actually sound to someone else.

Have you ever heard of a camera without a lens? In this activity, learners create a pinhole camera out of simple materials. They'll see the world in a whole new way: upside down and backwards!

In this activity, learners discover that it's difficult to distinguish between two different shades of gray when they aren't separated by a boundary.

How can you make one shade of gray look like two? By putting it against two different color backgrounds! This activity allows learners to perform this sleight of hand very easily.

In this activity, learners discover that our hands are not reliable thermometers.

This resource contains several mini-explorations using a slide projector as a light source to investigate light and the properties of images.

In this activity, learners use rice grains to model the composition of the atmosphere of the Earth today and in 1880. Learners assemble the model while measuring percentages.

In this activity about light and perception, learners create and observe moire patterns.

In this activity, learners explore liquid crystals, light and temperature. Using a postcard made of temperature-sensitive liquid crystal material, learners monitor temperature changes.

In this activity, learners sublimate dry ice and then taste the carbon dioxide gas.

In this activity, learners use a compact disc to make a spectrometer, an instrument used to measure properties of light.

An ordinary camera has a lens that makes an image on film. In a pinhole camera, a small hole replaces the lens.

Get all wrapped up in a lesson about skin!

In this activity, learners create a model using metric measuring tapes and atmosphere composition data.

In this activity, learners use plastic water bottles, wood, and water to build an inexpensive and portable tool to demonstrate one atmosphere of pressure at sea level.

In this activity, learners explore how polarizing sunglasses can help diminish road glare.

In this activity, learners trap a thin layer of air between two pieces of Plexiglas to produce rainbow-colored interference patterns.

In this activity, learners make a yeast-air balloon to get a better idea of what yeast can do. Learners discover that the purpose of leaveners like yeast is to produce the gas that makes bread rise.